JPS60182280A - Picture processor - Google Patents

Abstract

PURPOSE:To enable switching of a print size with simple constitution by changing oscillation frequency of an oscillator for generating sampling time prior to the number of samples. CONSTITUTION:An input video signal is converted into a digital signal by an A/D convertor 2 and inputted to a vertical interporating device 11, which controls a vertical interpolation through a size switching signal 13. When a print size is small, said device 11 will not perform the interpolation, and ony when the size is large, it performs the interpolation. The size switching signal 13 controls a timing generator 12 and changes oscillation frequency of the generator 12 so that the number of samples will be changed. An output of the generator 12 controls sampling timing of a picture of the convertor 2, and the picture is processed 3, transmitted to a printer 4 and printed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image processing device, and particularly to a video printer that allows switching of print sizes with a simple configuration.

[Prior art]

A block diagram of an example configuration of a conventional video printer for processing video images is shown in FIG. Input video signal 1 is A
The signal is converted into a digital signal by the /D converter 2, processed into a print signal by the image processing circuit 3, and printed by the printer 4.

Next, assume that this device is used to switch print sizes. Figure 2 shows a state where the number of sample points of image data is doubled and the print size is doubled (four times the area). Figure 3 shows the configuration block diagram of the video printer in this case. show. In FIG. 3, the same (equivalent) configuration as in FIG. 2 is indicated by the same reference numerals, and the input video signal 1 is
The A/D converter 2 converts the data into a digital signal, and the interpolation circuit 10 interpolates the data. The interpolated data is processed into printer signals by the image processing circuit 3,
The image is printed by the printer 4.

In the interpolation circuit 10, image data ? , 8.9. Image data 7 is the same as image data 5, image data 9 is the same as image data 6, and intermediate image data 8 is interpolated with each image data 5°6. In the case of linear interpolation, Image data 8 is obtained by taking the sum of image data 5 and 6 and dividing the sum by 2. The configuration described above performs interpolation to switch the print size of an image.

However, since such interpolation adds and divides at least two pixels in both the horizontal and vertical directions of the screen, it requires memory, adders, and dividers, and the hardware is complicated.
This method has the drawbacks of being expensive and complicating the timing of data processing.

〔the purpose〕

The present invention has been made in view of the above-mentioned problems, and is intended to enable switching of the print size of a video printer with a simple configuration.

〔Example〕

The present invention will be explained below based on the drawings. FIG. 4 is a block diagram of an embodiment of the present invention, and FIG.
The same (equivalent) configuration as in the figure is indicated by the same reference numeral. An input video signal 1 is converted into a digital signal by an A/D converter 2 and input to a vertical interpolator 11 . This vertical interpolator 1
1, the presence or absence of vertical interpolation is selected by controlling the size switching signal 13, and the vertical interpolator 11 operates so that there is no interpolation when the print size is small and interpolation is performed when the print size is large. The output of this vertical interpolator is subjected to signal processing by the image processing circuit 3 into a signal for printing, and is printed by the printer 4.

Further, the size switching signal 13 controls the timing generator 12, and in the case of a small print size, the number of horizontal samplings is small, and in the case of a large print size,
The number of horizontal samplings is increased.

This output of the timing generator 12 controls the image sampling timing of the A/D converter 2.

As explained above, for normal print sizes,
The number of samples in the horizontal direction of the image is small, and no interpolation is performed in the vertical direction. When the print size increases, the number of horizontal samplings of the image increases in accordance with the print size, and interpolation in the vertical direction is also performed. Therefore, the print size can be switched from 3 to 3 using the print nice 9J switching signal 13.

FIG. 5 shows an example of the circuit configuration of the timing generator 12. This figure shows an example in which sampling is performed in the horizontal direction, and 14 is a vertical synchronization signal VD synchronized with the video signal.
, 'Ig is a start signal of A/r) conversion. 15
．． 17 is a D-FF (D-type 7 ribs, 70 ribs) circuit, 16 is a NAND AND circuit), and 19 is an AND circuit, and these circuits output signals from the AND circuit 19 as shown in the timing chart of FIG. After the A/D conversion start signal 18 rises, the two vertical synchronizing signals 14. vo is output. As a result, one frame of the TV signal to be interlaced is extracted from the A/D conversion signal in synchronization with the vertical synchronization signal.

20 is a horizontal synchronization signal HD synchronized with the video signal; 21
．． 25 is an AND circuit, 22 is a preset circuit for presetting M preset values, 23.27 is a presettable down counter, 24 is an inverter, 2
6 is a preset circuit for presetting N brisset values.

The presettable fist counter 23 receives M horizontal synchronization signals HD as shown in the signal timing chart of FIG.
, and make this the number corresponding to the vertical blanking. Further, the presettable 0 counter 27 counts N horizontal synchronizing signals HD, which becomes the number of vertical image samplings.

, Therefore, depending on the configuration of each circuit 21 to 27, AND
From the circuit 25, N is equal to the number of samples in the vertical direction of the image.
horizontal synchronization signals are obtained.

Also, 28 and 34 are inverters, and 29 is NAN.
The DAND circuit includes a tapped delay line DL, 31
is an OR circuit, and 32 and 33 are AND circuits. With the above configuration, an oscillation output synchronized with the output signal of the inverter 28 can be obtained from the OR circuit 31, as shown in the signal timing chart of FIG. That is, NAND circuit 2
9. The delay line 30 constitutes a gated oscillator. This oscillation frequency is selected by selecting the tap output of the tapped delay line 30 using the size switching signal 13. That is, for a normal print size, tap 2 is set to lower the oscillation frequency, and for a large print size, tap T is set to raise the oscillation frequency.

Furthermore, 35.39 is an AND circuit, 36 is a preset circuit for setting a preset value, and 37.41
are respectively presettable down counters, 38 is an inverter, 39 is an AND circuit, and 40 is a preset circuit for setting a preset value P. The presettable down counter 37 counts up to a preset value. this is,
The horizontal blanking time is set from the horizontal synchronizing signal HD, and since the oscillation frequency changes depending on the print size, the horizontal blanking time is made constant by changing the preset value of the preset circuit 36. Further, the presettable down counter 41 counts the preset value P and sets the number of samplings in the horizontal direction. The timing chart of each of these signals is shown in
As shown in the figure. That is, the number of samples in the horizontal direction is determined by changing the preset value P as the print size is changed.

As explained above, when the A/D conversion start signal 18 is input, the input video signal 1 is transferred in the horizontal direction for one frame synchronized with the vertical synchronization signal VD, excluding the vertical and horizontal blanking periods. A control signal pulse 42 can be generated to sample the signal. Further, by using the print size switching signal 13, it is possible to change the number of samples in the horizontal direction and sample the same video signal in the horizontal direction.

Note that in order to increase the print size by X, the oscillation frequency may be increased by X, and the preset values of the horizontal counters 37 and 41 may be increased by X.

[Other Examples]

FIG. 10 shows another circuit configuration example of the timing generator 12, in which the same (corresponding) configurations as those in FIG. 5 are denoted by the same reference numerals, and redundant explanation will be omitted.

In this embodiment, the video signal is sampled in the vertical direction, and 43 is an AND circuit, 447- is a preset circuit for setting a preset value 2R, and 45 is a presettable down counter. Each of the above circuits 43
45, as shown in the signal timing chart of FIG. 11, the preset value 2R is counted by the presettable down counter 45, and 2R vertical synchronization signals are obtained from the AND circuit 43. The meaning of 2R preset values is that if the number of samplings in the horizontal direction is R, then in order to sample one frame of a television signal, two fields must be sampled, and starting with two vertical periods, This shows that data for one line can be sampled.

Therefore, to sample 8 horizontally, R
A vertical period twice as long as 1 is required. Furthermore, since the print size can be changed by changing the sampling point in the horizontal direction, it is possible to change the print size by changing the preset value 44.

Next, from the AND circuit 21, the presettable counter 2
The circuit configuration up to 7 determines sampling of the vertical force in the 8-direction, similar to the case of horizontal sampling in FIG.

Further, the circuit configuration from the inverter 28 to the OR circuit 31 also constitutes an oscillator whose phase is synchronized with the horizontal synchronization signal, as in the case of horizontal sampling in FIG. 46 indicates a preset circuit for setting a preset value 2Q, 47 a presettable up counter, 48
is a presettable down counter. The presettable up-counter 47 counts the vertical synchronization signal, and its output becomes the preset value of the presettable down-counter 48.

The presettable down counter 48 counts down the oscillation output from the OR circuit 31 from a preset value, and when it reaches O, outputs a sampling pulse 42'. In addition, as mentioned above, vertical sampling can sample two fields, so
1/2 of the output of the presettable up counter 47,
That is, the value with the ILSB (least significant bit) removed is set as the preset value of the presettable down counter 48. Further, the preset values of the preset circuit 46 of the presettable up counter 47 are also twice Q, which is 2Q. A timing chart of each of these signals is shown in FIG.

If the number of vertical synchronization signals after the input of the A/D start signal 18 is S, then the sampling pulse 42' is
After the horizontal synchronization signal from the D circuit 25 is input, the OR
This is generated when (Q+S/2) oscillation outputs from the circuit 31 are counted. Note that this S takes a number up to Q≦S(R).

As explained above, sampling in the vertical direction is also possible by controlling the print size and changing the number of samples in the horizontal direction.

〔effect〕

As described above using each embodiment, according to the present invention, when switching the print size in an image processing apparatus that prints a video signal, data in the vertical direction is increased by interpolation. In the horizontal direction, the data is increased by increasing the number of sampling points, which eliminates the need for memory, adders, dividers, etc. associated with horizontal interpolation, simplifying the system configuration. It is possible to avoid an increase in hardware costs.

Additionally, when you change the print size, you can preset the horizontal sample start point and sampling number, which has the effect of keeping the data range that can be captured in the video signal the same even if the print size changes. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the configuration of a conventional video printer, FIG. 2 is an explanatory diagram when the sample points of image data are doubled, FIG. 3 is a block diagram of the configuration of a video printer in that case, and FIG. 5 is a block diagram of the configuration of an embodiment of the video printer of the present invention, FIG. 5 is a circuit configuration diagram of a timing generator, FIGS. 6 to 9 are timing charts of each signal, and FIG. , another example of the circuit configuration of the timing generator, and FIGS. 11 and 12 are timing charts of each signal, respectively. 11- 1...Video signal 2...A/D converter 3...Image processing device (video printer)
4...Printer 11...Vertical interpolator 12...Timing generator 13...Size switching signal 14...Vertical synchronization Signal 20...Horizontal synchronization signal 30...Tapped delay line 42'...
...Sampling pulse 12--To Suga~8〉

Claims (1)

[Claims] An image processing apparatus for printing a video signal, characterized in that the print size is changed by changing the number of samplings by changing the oscillation frequency of a sampling timing generation oscillator.